Restore Your Cadillac’s Electrical Functions with a Plug-and-Play Solution
Is your 2008-2013 Cadillac CTS experiencing bizarre electrical problems? Flickering lights, malfunctioning power windows or locks, or a security system that acts up randomly are classic signs of a failing Body Control Module (BCM). As the central command for your vehicle’s body electronics, a faulty BCM can cause a cascade of frustrating issues, often leading to incorrect diagnoses and wasted money on other parts. Over my 20 years in diagnostics, I’ve seen countless vehicles where a simple BCM replacement solved complex, ghost-in-the-machine problems that had stumped other technicians.
This isn’t just a replacement part; it’s a direct-fit, reliable solution. We take the guesswork and hassle out of the repair by pre-programming this module to your vehicle’s specific VIN. This means it arrives at your door ready for installation, with the latest GM software updates already loaded. You get to skip the expensive trip to the dealership for programming, saving you both time and hundreds of dollars. By providing a properly configured 2008-2013 CTS BCM, we help ensure all integrated systems, from your interior lights to your security features, communicate and function as they did from the factory.
Case Study: A Tricky Diagnosis
A customer brought in a 2011 CTS with a complaint that was all over the map. The radio would turn off, the driver’s side window wouldn’t work intermittently, and the anti-theft light would flash, sometimes preventing the car from starting. The owner had already replaced the battery and alternator. A scan showed a slew of communication codes (U-codes) pointing to a network issue. Instead of chasing each code individually, my experience pointed to the central hub: the BCM. After confirming power and ground to the module were good, we swapped in a programmed BCM. Every single issue vanished. It’s a perfect example of how one failing module can mimic a dozen different problems.
Common Signs of a Failing BCM
If you’re noticing these issues, your Body Control Module is the likely culprit. Replacing your 2008-2013 CTS BCM can be the definitive fix.
- ✔ Erratic or non-functional interior and exterior lights.
- ✔ Power windows, door locks, or mirrors working intermittently or not at all.
- ✔ The security system engaging randomly or causing a no-start condition.
- ✔ Dashboard warning lights (like the airbag or service vehicle soon light) staying on.
- ✔ Communication error codes, particularly U-codes (e.g., U0140, U0155) when scanned.
- ✔ Wipers or horn activating on their own or not working when commanded.
A Straightforward Guide to Installation
Installing your new BCM is a manageable job for a confident DIYer. For the 2008-2013 CTS, the BCM is typically located on the left-hand (driver’s) side of the dash.
- Safety First: Always disconnect the negative terminal from your car’s battery and wait a few minutes before starting any electrical work.
- Access the Module: You will likely need to remove the lower dash panel beneath the steering column to gain access to the BCM. This usually involves a few screws or clips.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. Note their orientation. Then, unbolt or unclip the module from its mounting bracket.
- Install the New BCM: Mount the new, pre-programmed module in place of the old one. Securely reconnect all electrical connectors, ensuring they click into place.
- Reconnect and Test: Reinstall the dash panel, then reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all body functions—lights, locks, windows, etc.
- Post-Install Procedures: In some cases, additional steps may be needed. If your airbag light is on, a professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure. A ‘Brake Pedal Position Relearn’ might also be necessary for proper brake light and traction control operation.
Verified Vehicle Compatibility
This Body Control Module is a direct replacement for part number 25826124 and is compatible with a wide range of GM vehicles. While it is specifically programmed for the 2008-2013 CTS BCM application, it also interchanges with the following part numbers and fits the models listed below. Always verify your original part number for a perfect match.
Interchangeable Part Numbers: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20839063, 20864767, 20864768, 20921435, 20921436, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084
CADILLAC DTS 06-11 Body Control (BCM); (RH center dash)
CADILLAC ESCALADE 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
CADILLAC ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
CADILLAC ESCALADE EXT 10 Body Control (BCM); (under steering column), ID 25892622
CADILLAC SRX 07-09 Body Control (BCM); LH dash
CADILLAC STS 10 Body Control (BCM); center dash
CHEVROLET AVALANCHE 1500 10 Body Control (BCM); (under steering column), ID 25892622
CHEVROLET CAPRICE 11-13 Body Control (BCM)
CHEVROLET CAPTIVA SPORT 12 Body Control (BCM); (center dash), ID 20921435, 20921436 or 22860591
CHEVROLET EQUINOX 07-09 Body Control (BCM); (center dash)
CHEVROLET EXPRESS VANS 08-12
CHEVROLET IMPALA 06-13
CHEVROLET MONTE CARLO 06-07
CHEVROLET SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
CHEVROLET TAHOE 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
CHEVROLET TRAVERSE 09-12
GMC ACADIA 07-12
GMC SAVANA VANS 08-12
GMC YUKON & YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
HUMMER H2 08-09
PONTIAC G8 08-09
PONTIAC TORRENT 07-09
SATURN OUTLOOK 07-10
SATURN VUE 08-10
Note: This is a partial list. Please confirm your part number.
Frequently Asked Questions
Frequently Asked Questions
Do I need to send my old BCM back?
No, there is no core charge for this module. You can keep your original part.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we have programmed it with your VIN.
Is this a plug-and-play installation?
For most vehicles, yes. Because we pre-program it with your VIN, it should function immediately after installation. However, as noted, some vehicles may require additional relearn procedures for systems like the airbags or brake pedal sensor, which require a professional scan tool.
Will this fix my ‘Service Theft System’ message?
A faulty BCM is a very common cause of security system issues, including the ‘Service Theft System’ message and no-start problems. While not a guarantee for every case, replacing the BCM often resolves these faults.
What if my original part number isn’t listed?
The part numbers listed are the most common interchanges. If your number is not on the list, please contact us with your VIN and original part number. We can verify compatibility for you.